Teracom TCW220

Update: Using free email providers

After Gmail and Yahoo recently dropped the email encryption standards SSLv3 and RC4 due to security breaches, devices from the TCW2xx product range by Teracom could no longer send email notifications via these providers. This was due to the fact that the devices’ firmware did not support the newer, safer encryption standards employed by the email providers. The manufacturer offered an interim solution by providing an in-house email service without any encryption standards. But a permanent solution has now been found with the release of an updated firmware version: The new firmware for the devices TCW220 and TCW241 now supports the TLS protocol, enabling both products to once again send email notifications via providers such as Gmail and Yahoo.

The updated firmware can be downloaded from the manufacturer’s website:

Teracom TCW220: firmware v1.206

Teracom TCW241: firmware v1.206

Using free email providers

The possibility of sending email-notifications is one of the key features of many of the monitoring-devices we offer. Many customers use this functionality together with free email services by providers such as Gmail or Yahoo Mail. This works reliably if the respective devices support the transfer of encrypted emails. You can check whether this is the case by looking for terms such as SSL, TLS, StartTLS or simply “encrypted emails” on the device’s data sheet. These terms refer to complex standards, whose details are usually not found in the devices’ manuals. Usually, however, the manufacturer will ensure that their devices are compatible with the major email providers.

Nonetheless, crafty people frequently locate security loopholes in these encryption methods. The email-providers commonly react to such information by implementing new standards while simultaneously ceasing to support older ones. Usually, they will notify you of such changes ahead of time. However, many of us will surely sometimes miss such notifications or react too slowly. Thus, it may happen that your device will no longer be able to send you email-alerts. It is therefore advisable to check this functionality regularly. Some devices can even send regular status notifications, for instance once a week. If such a message fails to arrive, you should take action quickly. A short-term solution to the problem is simply changing the email-provider. However, one should be aware that the new provider will most likely also discontinue the support for the standard deemed unsafe sooner or later.

Recently, Gmail and Yahoo Mail reacted to new information on such security loopholes concerning the encryption methods SSLv3 and RC4. As a consequence, both providers no longer support these standards. This currently affects the devices in the product line TCW2xx by Teracom. At the moment there is unfortunately no alternative firmware that supports newer standards. However, the manufacturer has provided the service TCW Gateway that is free for all customers and can be used to send unencrypted emails.

Smart Ethernet Thermometer HWg STE2

New: HWG STE2 – Smart Ethernet Thermometer

The popular product from HW group, the Ethernet thermometer HWg STE is now available in its second generation. STE2 not only bundles the basic functionality of its smaller siblings HWg STE, HWg STE plus and HWg STE PoE, but also allows sending of encrypted alert notifications and WiFi connectivity.

For years the reliable Ethernet thermometers of Czech company HW group have monitored the climate in server rooms, HVAC environments and offices. With HWg STE2, the HW group launched a new stand-of-the-art product.

WiFi connectivity

STE2 can connect to WiFi networks. The antenna is hidden within the enclosing

Encrypted emails

STE2 sends alert notifications if critical thresholds are exceeded. Emails are sent encrypted (StartTLS /TLS)

Power Supply over PoE

The unit can be powered by the 5V adapter included in delivery or alternatively via Power over Ethernet.

1-Wire sensors

HWg STE2 measures up to three parameters over 1-wire probes. A temperature sensors is included in delivery. Additional sensors are available as accessories.

Comparison of HWg STE units

plus PoE

Digital inputs




Encrypted emails
Max. number of sensors 3 2 2 2 2
Cloud portal SensDesk
Power over Ethernet
Price 198,00 € 271,30 198,80 € 230,00 € 155,00 €